Question

state the meaning of layers ?why limestone is added in their diet? name one other dietary requirement of poultry birds

Answer 1

Layers are poultry animals who lay eggs.
Limestone is added to form the shell of the eggs.
They require an adequate amount of water and the sufficient amount of proteins and carbohydrates. 

Answer 2

the period from sexual maturity till the end of egg laying is called laying period , and the chickens during this period are called layers.
limestone is added to their diet to develop the shell of the egg.
vitamin A and vitamin K are the dietary requirements of poultry birds.
hope it's helpful....